Correction of Numerical Model for Vibration Based on Actual Measurement Analysis of a Scientific Research Ship
A scientific research ship with high requirements for vibration control is taken as the example to study the precise prediction of ship vibration characteristics based on the measurements and the finite element analysis.The vibration response of the ship under normal navigation conditions are analyzed,and a three-dimensional finite element model of the ship is established to calculate the time-domain transient response of the ship under the combined excitation force of the main engine and the propeller,of which the excitation forces to the ship are applied according to the calculation method in the specifications and guidelines.Measured data are used to modify finite element parameters such as structural damping,attached water mass,and constraint settings,to obtain the vibration response results of each measurement point on the hull.The results indicate that the modified numerical simulation can well fit the measured vibration response and the modified finite element model can predict more accurately the vibration response of ship structures at any position and under different working conditions.
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